Pump drive



Nov. 15, 1955 P. J. ENDEBAK 2,723,626

PUMP DRIVE Filed March l, 1949 3 Sheets-Sheet l Nov. l5, 1955 P. J.ENDI-:BAK 2,723,625

PUMP DRIVE Filed March 1, 1949 s sheets-sheet 2 Nov. 15, 1955 FiledMarch 1, 1949 PUMP DRIVE 3 Sheets-She@C 5 Unite tes atent PUMP DRIVEPeter J. Endebak, Chicago, Ill., assigner to Tuthill Pump Company, acorporation of Illinois Application March 1, 1949, Serial No. 78,905 4Claims. (Cl. 10S-205) This invention relates to pumps for handlingliquids in pest and weed control, and has for its principal object toprovide a simple, durable pump that may be readily driven from the powertake-off of a tractor.

Fig. l is a front side elevation of a pump embodying the invention;

Fig. 2 is a vertical central section through the same crosswise to thedriving shaft;

Fig. 3 is a vertical section in a plane through the axes of the gears;

Fig. 4 is a perspective view of the end portion of the shaft for themain gear;

Fig. 5 is a perspective view of a driving connection adapted to beassociated with that shaft and a power takeoff of a tractor;

Fig. 6 is an enlarged fragment of Fig. 3 with a different drivingconnection associated with the main shaft of the pump; and

Fig. 7 is an end view of Fig. 6 looking from the right.

The pump casing includes a at sided body portion 10 having a contourshown in Figs. l and 2, a front cover plate 11, and a back cover plate12 secured to the body portion by bolts 13.

The body portion is provided with a pump chamber, generally indicated by14 (Fig. 2), in which are received the pump gears 15 and 16, and whichis ported at 17 and 18 to provide a low pressure or intake chambersection and a high pressure or discharge chamber section, respectively.

The smaller gear or pinion 16 is mounted on a hollow shaft 19 having itsend portions journalled in bearings 20 pressed into bearing sockets 21in the covers 11 and 12, respectively, against the bearing seats 22 and23.

The main pump gear 15 is keyed to a hollow shaft 24 having its endportions journalled in bearings 25 and 26 pressed into the covers 11 and12. The bearing 26 is pressed into a socket 27 against a bearing seat28, and the bearing is pressed into a bore 29 terminating in acounterbore 30 opening to the outside of the back cover 12.

The clearance between the side faces of the gears 15 and 16 and theadjacent faces of the front and back covers 11 and 12 is on the order of11/2 to 2 thousandths, as indicated by the reference numeral 31, whereasthe clearance between the opposite sides of the gears 15 and 16 and theadjacent faces of the bearings 20, 25, and 26 is on the order of plus1/2 thousandths to 0. By this means, the bearings form an effective sealwith the pump gears, and prevent leakage from the discharge chamber 18to the intake chamber 17.

The inner faces of the front and back covers 11 and 12 are cored out, orotherwise recessed, at 34 in line with similar recesses in the bearings25 and 26 communicating with grooves 36 along the bore of the bearings25 and 26 open to the surface of the shaft 24.

CII

This provides a relief connection to the intake or low pressure side ofthe pump to prevent the possibility of pressure developing adjacent tothe ends of the shaft 24 that would throw the arrangement out ofbalance.

Preferably, the bearings 25 and 26 are made of sintered carbon, and, inthe course of machining the bearing surfaces, small particles of carbonare pushed into the pores of the bearing material, and any irregularityin the shaft tends to loosen those particles, which then tend to workbetween the shaft and the bearing, and travel along the surface. Beingextremely hard material, they become abrasive. The grooves 36, however,form a trap for those particles by which they are readily eliminatedfrom the bearing surfaces.

The counter bore 30, and therefore the joint between the shaft 24 andthe back cover 12, with the bearing 25 is etfectively closed and sealedby a metal cap 33 lled with a rubber ring 39 having an angular groove40.

Some of the liquids used for weed and pest control are highly corrosive,and, in order to protect the pump from corrosion by those or othermaterials, it is preferable to make the several parts of corrosionresisting material. For example, in a pump that has been foundsatisfactory, the casing is made of heat treated aluminum alloy known asAlcoa 35 6T6.

The gear 16 and the shaft 19 are made of an alloy containingapproximately 88% copper, 10% tin, 2% zinc. The gear 15 and the shaft 24are made of an alloy composed of approximately 9 to 10% aluminum; iron1.25 maximum, the principal remainder copper.

In order to permit the pump to be driven from the power take-off of atractor, or other machine, the shaft 24 is provided with a drivingconnection comprising a sleeve 42 having an inturned ange 43 equippedwith teeth 44 adapted to engage in the grooves of a spline shaft, suchas a standard SAE spline shaft customarily used on tractors. The sleeve42 is provided with an opening 45 adapted to be aligned with a threadedopenign 46 in the shaft 24 to receive a screw threaded Sems fastenerunit 47, which includes a locking washer 48.

This driving connection is particularly suited to use with a 1% splineshaft, commonly forming the power take-off of a Ford-Ferguson tractor,indicated by the dotted lines 48 in Fig. 3.

For use with a 1% SAE spline shaft forming the power take-olf on sometractors, there is provided another driving connection 50, shown inFigs. 6 and 7, which cornprises a length of tubing adapted to betelescoped within the shaft 24 substantially as shown in Fig. 6, andthreaded at 51 to receive the Sems fastener unit 47.

The projecting end of the driving connection 50 has inwardly directedteeth 52 adapted to be received in the grooves of the SAE spline shaft,indicated by the dotted lines 53 in Fig. 6. That shaft should projectwell into the sleeve 50 substantially as indicated, and the projectingportion of the latter should extend within the overhanging gear casing54 of the tractor.

The driving connections are preferably made of steel and case hardened,particularly at the toothed portions.

The body portion 10 is provided with threaded openings 51 at the bottomto receive stud bolts 52a. In some uses, they will fasten the pump to abase, generally indicated at 53a, Fig. l; and, in others, to an angularbase, generally indicated at 54, Fig. 2; many having slots 55 to receivebolts that ordinarily hold a part of the tractor casing in place.

I claim:

1. In a pump and driving means assembly of the class in which a gearpump having a hollow shaft to be driven which has smooth internal andexternal surfaces is telescoped over the externally splined portion ofthe power take-off shaft of a tractor or like machine, the cornbinationwith said telescopedv shafts of a connector cornprising a hollow bodyterminating at one end in a tubular portion provided with smoothinternal and external surfaces telescoped over the splined portion ofsaid power take-off shaft and having one of its said surfaces engagedwith one of the named surfaces of the pump shaft and terminating at itsother end in inwardly directed teeth drivingly engaged in the grooves ofsaid splined portion, and fastening means extending into the tubularportion of the connector and into the pump shaft for securing saidshafts against relative turning.

2. In a pump and driving means assembly of the class in which a gearpump having a hollow shaft to be driven which has smooth internal andexternal surfaces is telescoped over the externally splined portion ofthe power take-off shaft of a tractor or like machine, the combinationwith said telescoped shafts of a connector comprising a hollow bodyterminating at one end in a tubular portion provided with a smoothinternal surface telcscoped over the splined portion of said powertake-off shaft and having its said surface engaged with the outersurface of the pump shaft and terminating at its other end in inwardlydirected teeth drivingly engaged in the grooves of said splined portion,and fastening means extending into the tubular portion of the connectorand into the pump shaft for securing said shafts against relativeturning.

3. In a pump and driving means assembly of the class in which a gearpump having a hollow shaft to be driven which has smooth internal andexternal surfaces is telescoped over the externally splined portion ofthe power take-olf shaft of a tractor or like machine, the combinationwith said telescoped shafts of a connector comprising a hollow bodyterminating at one end in a tubular portion provided with a smoothexternal surface telescoped over the splined portion of said powertake-off shaft and having its said surface engaged with the innersurface of the pump shaft and terminating at its other end in inwardlydirected teeth drivingly engaged in the grooves of said splined portion,and fastening means extending into the tubular portion of the connectorand into the pump shaft for securing said shafts against relativeturning.

4. In a pump and driving means assembly of the class in which a gearpump having a hollow shaft member to be driven which has smooth internaland external surfaces is telescoped over the externally splined portionof the power take-off shaft of a tractor or like machine, thecombination with said telescoped shaft member and shaft of a connectormember comprising a hollow body terminating at one end in a tubularportion provided with smooth internal and external surfaces telescopedover the splined portion of said power takeoff shaft and having one ofits said surfaces engaged with one of the named surfaces of the pumpshaft member and terminating at its other end in inwardly directed teethdrivingly engaged in the grooves of said splined portion, and fasteningmeans securing said shaft and shaft member against relative turningcomprising a set of circumferentially spaced screws extending throughone of said members and threaded into the other member.

References Cited in the tile of this patent UNITED STATES PATENTS1,376,903 Strickland May 3, 1921 1,973,702 Cooke Sept. 18, '19342,115,325 Behringer Apr. 26, 193.8 2,174,223 Frauenthal Sept. 26, 1'9392,176,049 Floraday Oct. 17', 1939 2,176,322 Barrett Oct. 17, 19392,198,654 Calkins et al Apr. 30, 19.40 2,288,596 Pierce July 7, 19422,365,146 Wichorek Dec. 12, 1944. 2,374,207 Jackson Apr. 24, 19.45'2,391,072 Pugh Dec. 18,v 1945 2,466,097 Graue Apr. 5, 1949 2,525,695Lombard Oct. 10, 1950

